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's research bases in antarctica. during the summer, we can have more than 100 people here. most of the science is done in the summer. that's when the animals are here. there's more opportunity to work. >> reporter: the experts are trying to understand the impact of climate change by examining links between ice volume and wildlife. this unmanned apparatus can check the condition of under water ice. it can precisely measure thickness and record changes in volume. scientists also use krill as a sort of canary in a coal mine. the small crustaceans live below the ice. estimates suggest their population is in decline. researchers artificially changed the environment to monitor the impact on the crustaceans. they're trying to find out if the thinning of the ice could affect krill numbers. bigger animals at the south pole provide even more data. scientists in the university of tasmania have attached small devices on elephant seals to record their movements and the temperature of the sea where they swim. they're aiming to determine how changes in the ice volume and water temperature affect behavior. >>
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